Methods and apparatuses for providing a signal sideband signal via one or more switching method or apparatus. Pulse width modulation is utilized and high efficiency of amplification is provided via a switch mode amplifier. DC restoration may provide for improved carrier suppression. Also subtraction of complementary pulse width modulated signals provides for a multiplier circuit or a multiplier function. A nonlinear carrier signal coupled to a pulsewidth modulator provides for improved amplitude modulation linearity and/or reduced sideband distortion.